JP4756595B2 - Sheet cutting apparatus, bookbinding apparatus using the same, and image forming apparatus - Google Patents

Description

  The present invention provides a sheet bundle cutting apparatus that automatically cuts sheet bundles that are sequentially fed, a bookbinding apparatus that trims and finishes the periphery of bound bookbinding sheets, and automatically processes from binding to cutting of image-formed sheets. The present invention relates to an improvement in the cutting performance of a cutting blade that cuts a sheet bundle.

  2. Description of the Related Art Generally, a sheet cutting device that cuts a bundle of sheets formed by aligning and forming sheets formed with an image forming device into a predetermined size is incorporated as a finishing processing device in a bookbinding process or as a cutting unit in a bookbinding device. Widely used as a device. This type of cutting device is known to have a structure in which the cutting edge of a sheet bundle is pressed and held by a press mechanism, and the sheet bundle is cut by a cutting blade means. For example, in Patent Document 1, a sheet bundle arranged in a bundle is conveyed to a cutting position, the cutting edge is press-supported by a turntable at the cutting position, and in this state, the sheet is cut by a flat cutting blade. .

After cutting the peripheral edge of the sheet bundle, the sheet bundle is carried out of the apparatus. As the cutting blades for cutting, a flat blade and a disk-shaped blade are known as in the same document. The former is a sheet bundle cut by a guillotine mechanism, and the latter is cut by a disk blade rotating mechanism. Conventionally, SK material, SUS material, ceramic material, etc. are used for the cutting blade used in such a cutting device, and it is expensive for high-speed cutting such as high-speed cutting for specialized equipment such as bookbinding depending on the field to be used. For materials that are abundant and for relatively simple bookbinding such as office work, materials that are inexpensive and rich in maintainability are selected.
JP 2003-071777 A

  The use of an iron-based cutting blade, such as SK material, for cutting the sheet bundle as described above is inexpensive and suitable for a relatively simple cutting device. There is a problem. In the case of an iron-based cutting blade, the blade surface may be oxidized and rusted if not used for a long period of time. In addition, rust may be generated in the same manner as when the usage environment is high in humidity, for example. Thus, when rust is generated on the surface of the blade edge, not only the cutting performance is inferior, but also the problem that the rust adheres to the cut surface of the sheet bundle and stains the bound sheet.

  Conventionally, in such a case, a processed bookbinding sheet is discarded and treated again, such as being processed again. For this reason, when the apparatus is not used for a long period of time, a complicated pretreatment process such as starting the apparatus after rusting such as polishing the cutting blade is forced. Further, when an oil film is applied and formed for rust treatment, the oil film component may adhere to the sheet cut surface and cause the same problem. Therefore, if the cutting blade is made of a ceramic-based nonmetallic material, the problem of rust can be solved, but it becomes very expensive and there is a problem that it is not suitable for a simple cutting apparatus. Therefore, the present invention eliminates the need to remove and polish the cutting blade each time the device is used, for example, an iron-based cutting blade, and enables high-quality bookbinding without contaminating the cutting surface. It is an object of the present invention to provide a sheet cutting apparatus, a bookbinding apparatus using the sheet cutting apparatus, and an image forming apparatus.

The present invention adopts the following configuration in order to solve the above problems. And pressing means for holding the sheet bundle at a predetermined cutting position, a cutting means for cutting the sheet bundle held by the pressing means, the bundle conveying means for feeding the sheet bundle to the cutting position, the cutting means and the a sheet cutting device comprising a control means for controlling the bundle conveyance unit, wherein the control means has a cutting width setting means for setting the cutting width from the paper size information and the final finishing size information of the sheet bundle, the control means, said bundle conveying means to feed the sheet bundle by Ri said cutting position, the first operation mode for cutting the sheet bundle by the cutting means at the set finish cutting width by the cutting width setting means A sheet bundle is fed to the cutting position by the bundle conveying unit, and the sheet bundle is cut a plurality of times by the cutting unit with a cutting width smaller than a finishing cutting width set by the cutting width setting unit. A second operation mode for cutting by the cutting width, and the control means further comprises a time measuring means for measuring an interval time of the cutting operation of the cutting means, and the time measured by the time measuring means in advance. When the set reference time is exceeded, the sheet bundle is cut by the cutting means in the second operation mode, and when the time measured by the time measuring means is less than the reference time, the cutting means in the first operation mode Cut the sheet bundle.
A pressing unit that holds the sheet bundle at a predetermined cutting position; a cutting unit that cuts the sheet bundle held by the pressing unit; a bundle conveying unit that feeds the sheet bundle to the cutting position; and the cutting unit And a control unit for controlling the bundle conveying unit, wherein the control unit includes a cutting width setting unit for setting a cutting width from the paper size information and the final finishing size information of the sheet bundle. The control means causes the sheet bundle to be fed to the cutting position by the bundle conveying means, and the sheet bundle is cut by the cutting means with the finishing cutting width set by the cutting width setting means. The sheet bundle is fed to the cutting position by the bundle conveying means, and the sheet bundle is cut a plurality of times by the cutting means with a cutting width smaller than the final cutting width set by the cutting width setting means. A second operation mode for cutting the finished cutting width, and the control means further includes a humidity measuring means for measuring the environmental humidity of the apparatus, and the humidity measured by the humidity measuring means is preset. When the humidity is higher than a reference humidity, the cutting unit cuts the sheet bundle in the second operation mode, and when the humidity measured by the humidity measurement unit is lower than a preset reference humidity, the cutting unit uses the cutting unit in the first operation mode. Cut the sheet bundle.

Also, a pressing unit that holds the sheet bundle at a predetermined cutting position, a bundle conveying unit that feeds the sheet bundle to the cutting position, and a position that can be adjusted along the sheet bundle feeding direction at the cutting position. A sheet cutting apparatus comprising: a cutting unit having a cutting blade; a cutting blade moving unit that shifts a position of the cutting blade; and a control unit that controls the cutting unit, the bundle conveying unit, and the cutting blade moving unit. a is, the control means has a cutting width setting means for setting the cutting width from the paper size information and the final finishing size information of the sheet bundle, before Symbol control means offsets the cutting blade by the cutting blade moving means a first operation mode in which Ru is cut the sheet bundle by the cutting means at the set finish cutting width by the cutting width setting means is, by offsetting the cutting blade by the cutting blade moving means The sheet bundle by the cutting means at the set finish cutting width smaller than a cutting width serial cutting width setting means to cut a plurality of times a second operation mode for cutting the finishing cutting width of, the control means, further comprising a time measuring means for measuring the interval time of the cutting operation of prior SL cutting means, the sheet bundle by the cutting means prior Symbol second operation mode when timing clock means is measurement time of the reference time or more the preset When the time measured by the time measuring means is less than the reference time, the sheet bundle is cut by the cutting means in the first operation mode.
Further, a pressing unit that holds the sheet bundle at a predetermined cutting position, a bundle conveying unit that feeds the sheet bundle to the cutting position, and a position that can be adjusted along the sheet bundle feeding direction at the cutting position. A sheet cutting apparatus comprising: a cutting unit having a cutting blade; a cutting blade moving unit that shifts a position of the cutting blade; and a control unit that controls the cutting unit, the bundle conveying unit, and the cutting blade moving unit. The control means includes a cutting width setting means for setting a cutting width from the sheet size information and final finishing size information of the sheet bundle, and the control means offsets the cutting blade by the cutting blade moving means. A first operation mode in which the sheet bundle is cut by the cutting means with a finish cutting width set by the cutting width setting means, and the cutting blade is offset by the cutting blade moving means. The control means has a second operation mode in which a sheet bundle is cut a plurality of times by the cutting means with a cutting width smaller than the finishing cutting width set by the cutting width setting means, and the finishing cutting width is cut. The apparatus further comprises humidity measuring means for measuring the environmental humidity of the apparatus, and when the humidity measured by the humidity measuring means is equal to or higher than a preset reference humidity, the sheet bundle is cut by the cutting means in the second operation mode, and the humidity When the humidity measured by the measuring means is less than a preset reference humidity, the sheet bundle is cut by the cutting means in the first operation mode.

The cutting width setting means has input means for inputting paper size information and final finishing size information, and is configured to calculate a finishing cutting width based on information from the input means.

  In the present invention, when a sheet bundle is cut by a cutting means at a predetermined cutting position, the bundle is conveyed so that the sheet is cut a plurality of times from the edge of the sheet bundle with a cutting width smaller than the final finishing cutting width and finished to the final cutting width. Since the cutting means and the cutting means are controlled, even if rust or oil film adheres to the cutting edge surface of the cutting blade, the finished sheet bundle has rust, oil, etc. on the cut surface. There is no risk of adhesion, and high-quality cutting finish is possible. Therefore, it is possible to use an iron-based material that is inexpensive and easy to regrind as a cutting blade. In addition, a first operation mode in which the cutting means is cut once in the final cutting width and a second operation mode in which the cutting means is cut into the final cutting width in two or more times are provided. If it is configured to perform cutting in the second operation mode, it is possible to obtain a remarkable effect such that continuous cutting processing can be efficiently performed according to conditions.

  As shown in FIG. 1, the sheet cutting apparatus A has a sheet bundle conveying path 11, a cutting position CP (see FIG. 2) set in the conveying path 11, and a press for pressing and holding the sheet bundle S at the cutting position CP. A means 32, a cutting means 30, and a bundle conveying means (a rotary table unit described later) 20 for feeding the sheet bundle S to the cutting position CP are configured. In the illustrated bundle conveying path 11, a carry-in roller 12, a rotary table unit (bundle conveying means) 20 for feeding the sheet bundle S to the cutting position CP, and a cutting means 30 for cutting the sheet bundle S are sequentially arranged on the downstream side. Has been. A sheet discharge roller 40 is disposed at the exit end of the bundle conveyance path 11, and a storage stacker 45 and a waste storage box 50 are disposed below the discharge roller 40. In the figure, the bundle conveying path 11 for conveying the sheet bundle S set at the receiving port 11a is configured in a substantially vertical direction, and the sheet bundle S from the sheet discharge roller 40 is stored in the storage stacker 45 in an inverted posture. The storage stacker 45 and the waste storage box 50 are disposed below the bundle transport path 11.

  At the receiving port 11a of the sheet cutting apparatus A arranged in this way, the bound sheet bundle S is bound, for example, the front and back sides of the saddle stitched sheet bundle are wrapped with a cover sheet, and the back portion is bound with adhesive glue ( It is prepared in the case of case binding) or in a state where the back portion of the sheet bundle S is stapled. A carry-in roller 12 is provided downstream of the receiving port 11a, and a pair of rollers are arranged so as to approach and separate from each other according to the thickness of the sheet bundle S, and are connected to the conveyance motor M1. The carry-in roller 12 is connected to a sheet bundle thickness detecting means 13 for detecting the thickness of the sheet bundle S, and detects the distance between the pair of rollers (the amount of movement of the rollers) to detect the thickness. A sheet sensor S1 that detects the leading edge of the sheet bundle S is disposed at the receiving port 11a, and detects the carry-in of the sheet. The detection of the thickness of the sheet bundle S and the leading edge of the sheet is used for subsequent control, for example, setting of a standby position of the cutting unit 30 described later. 10a is an opening / closing cover disposed at the receiving port 11a.

  A rotary table unit 20 that deflects the direction and orientation of the sheet bundle S is disposed in the bundle conveyance path 11 on the downstream side of the carry-in roller 12. The turntable unit 20 includes a turntable 21 and a gripper 22, and is configured to be movable downward in the rotation and conveyance path direction with the sheet bundle S gripped by both of them. For this reason, the gripper 22 is supported by the unit frame 23 so as to be movable in the direction perpendicular to the conveyance path, and is connected to the gripper motor MG. Further, the rotary table 21 is supported by the unit frame 23 so as to be able to turn and is connected to a turning motor MT. The unit frame 23 is supported by the guide rail 24, is supported so as to be movable in the vertical direction in FIG. 1, and is connected to the lifting motor MU.

  Accordingly, the bundled sheet S from the carry-in roller 12 is sent to the rotary table unit 20 and is sandwiched between the rotary table 21 and the gripper 22, and the rotation of the rotary table 21 deflects the orientation of the sheet bundle S. That is, it becomes possible to make the top part, the ground part, and the fore edge part of the bundled sheet S face the cutting means 30 on the downstream side. At the same time, the rotary table unit 20 is moved to the downstream cutting position CP along the bundle transport path 11 by the lifting motor MU, and the cutting width is set by the feed amount.

  The configuration of the rotary table unit 20 will be described in detail. FIG. 2 is a perspective view thereof, and FIG. 3 is a plan view of FIG. A guide rail 24 is arranged on the apparatus frame along the bundle conveying path 11, and a unit frame 23 is fitted and supported on the guide rail 24 and is supported so as to be movable in the vertical direction in FIG. A rotary table 21 is rotatably supported on the unit frame 23 by a shaft 21a, and a gripper 22 is rotatably supported on the movable frame 23a by a shaft 22a on the side facing the bundle conveying path 11.

The movable frame 23a is supported by a unit frame (fixed side) 23 so that the gripper 22 can be moved toward and away from the rotary table 21, and is connected to the gripper motor MG. Therefore, the unit frame 23 is supported by a guide rail 24 and is fixed to a timing belt 25 disposed on an apparatus frame (not shown), and an elevating motor MU is connected to the timing belt 25. Accordingly, after the sheet bundle S fed by the carry-in roller 12 is gripped by the rotary table 21 and the gripper 22, the entire rotary table unit 20 moves along the bundle conveyance path 11, and the lower end edge of the sheet bundle S is moved. It is configured to feed to the cutting position CP.

  A cutting means 30 is disposed at the cutting position CP on the downstream side of the rotary table unit 20. The illustrated cutting means 30 includes a flat blade-shaped cutting blade 31, a pressing means 32, and a die member 33, and the pressing means 32 and the cutting blade 31 are disposed to face each other with the die member 33 and the bundle conveyance path 11 interposed therebetween. The press means 32 includes a press member 32 a and a press motor MP that presses and moves the press member 32 a toward the die member 33, and the press member 32 a clamps the sheet bundle S between the die member 33 by driving the press motor MP. . As a result, the sheet bundle S is held at the cutting position CP.

  FIG. 4 shows a part of the pressing means 32, which is provided with a movable pulley 35 supported so as to be movable in the pressurizing direction of the apparatus frame, and a pressing member 32a is fixed to a traction belt 34 laid over the movable pulley 35. ing. One end (fixed side) of the traction belt 34 is connected to a spring (not shown), and the other end is connected to a press motor MP. As shown in FIG. 4, the traction belt 34 and the press motor MP are symmetrically disposed at both ends of a lever-like press member 32a that presses the width direction of the sheet bundle S. Further, the flat blade-shaped cutting blade 31 is supported by the apparatus frame so as to be movable in the illustrated horizontal direction, and is connected to the cutter motor MC.

  As shown in FIG. 5, FIG. 5A shows a state immediately before cutting the sheet bundle S, and FIG. 5B shows a state immediately after cutting. The cutting blade 31 is supported so as to be movable in the horizontal direction in the figure, and reciprocates by the cutter motor MC. The cutting blade 31 is provided with a sensor flag 31a, and a home position sensor SHP and a cutting position position sensor SCP are disposed.

  Accordingly, the sheet bundle S sent from the rotary table 21 is held by the pressing means 32, and the edge is cut by the cutting means 30 in this state. After cutting one end surface of the sheet bundle S, for example, the top portion, the posture is deflected by the rotary table 21. Next, for example, the ground portion is cut, and then the fore edge portion is cut. After the predetermined edge portion is cut in this way, when the nipping of the rotary table 21 is released, the sheet bundle S falls toward the sheet discharge roller 40 on the downstream side. The paper discharge roller 40 is composed of a pair of rollers and is connected to a drive motor (not shown). A flapper member 42 is provided downstream of the paper discharge roller 40 and is arranged so as to guide cutting waste falling from the cutting position CP to the waste storage box 50. The flapper member 42 is supported by a base end portion 42a so as to be swingable, and is connected to a flapper motor (not shown).

  Accordingly, the operation of the above-described apparatus will be described with reference to FIG. 6. The sheet bundle S is subjected to, for example, bookbinding and binding as a pre-process, or is bound from a bookbinding apparatus (described later) connected upstream of the receiving port 11a. The sheet bundle S thus set is set in the receiving port 11a (St100). Although not shown in FIG. 1, gate means for abutting and restricting the front end of the sheet bundle such as a gate stopper and a registration roller is disposed downstream of the carry-in roller 12. The sheet sensor S1 detects the sheet bundle S set in this way, and the conveyance motor M1 of the carry-in roller 12 is driven to nip the sheet bundle S (St101). At this time, the sheet bundle thickness detection means 13 detects the bundle thickness. The bundle thickness information is sent to, for example, the control CPU of the apparatus, and the subsequent operation is controlled based on this information.

  Next, the carry-in roller 12 is activated and rotated by the conveyance motor M <b> 1 and sends the sheet bundle S to the rotary table 21 on the downstream side. In the rotary table 21, the gripper 22 holds the sheet bundle S with the gripper motor MG (St102). Therefore, the rotary table 21 is rotated by a predetermined angle, for example, 180 degrees by the turning motor MT to deflect the posture of the sheet bundle S (St103). In the figure, the sheet bundle S is set with the back portion, which is the binding surface, facing down, and the edge portion on the side opposite to the back portion, the top portion, and the ground portion are cut in this order. Accordingly, the sheet bundle S is rotated 180 degrees and its posture is deflected so that the fore edge portion faces the cutting position CP.

  After the sheet bundle S is thus changed to a preset posture, the rotary table unit 20 is lowered along the bundle conveyance path 11 by the lifting motor MU. At this time, the leading edge detection sensor S2 is disposed at the cutting position CP of the bundle conveyance path 11 to detect the leading edge of the sheet bundle S (St104). When the sheet bundle S is conveyed by the detection signal corresponding to a feed amount instructed by a control CPU, which will be described later, the lower edge of the sheet bundle S overruns from the cutting position CP to the portion corresponding to the cutting amount (St105). Then, the press motor MP of the press means 32 is activated, and the press member 32a presses and holds the sheet bundle S on the die member 33 (St106).

  Next, the cutter motor MC is activated by a signal (press end signal) from the press end sensor Sp arranged in the pressing means 32, and the cutting blade 31 moves from the standby position WP shown in FIG. Then, the lower edge of the sheet bundle is cut into the state shown in FIG. 5B (St107). The cutting blade 31 moves from the home position indicated by HP in FIG. 5B to the standby position WP based on the bundle thickness information from the preceding sheet bundle thickness detection means 13 and stands by. The standby position WP is set to a position according to the bundle thickness, such as a position close to the home position HP when the sheet bundle S is thick and a position far when the sheet bundle S is thin. This is because the cutting operation is performed quickly. For this reason, the cutting blade 31 is provided with a sensor flag 31a. Position sensors SHP and SCP for detecting the sensor flag 31a are arranged as shown in FIG. 5B, and the position sensor SHP is a home position HP. The position sensor SCP detects the cutting position DP. Simultaneously with the cutting of the sheet bundle S, the cut waste is stored in the waste storage box 50 (St108). During the cutting operation of the sheet bundle S, the flapper member 42 described above is moved from the broken line position to the solid line position in FIG. 5B, and a flapper motor (not shown) is guided so as to guide the cutting waste falling to the waste storage box 50 side. ).

  Next, after the cutting operation is completed, the press motor MP of the pressing means 32 rotates in the reverse direction to release the pressing of the sheet bundle S (St109). Before and after this, the cutting blade 31 returns to the home position direction by the reverse rotation of the cutter motor MC, and returns to the standby position WP when there is a subsequent cutting (St110). Accordingly, it is determined whether or not the above-described cutting of the lower edge of the sheet bundle has been set in advance, for example, in three directions (top portion, ground portion, and fore edge portion) (St111). It is carried out to 45 (St112). When the scheduled cutting is not completed, the rotary table 21 backs the transport path 11 by a predetermined amount in order to secure an area for rotating the sheet bundle S.

  Thereafter, the sheet bundle S is rotated by 90 degrees (St113), for example, and the process returns to Step 104 described above. When the sheet bundle S is carried out to the storage stacker 45, the flapper member 42 is moved to the position indicated by the broken line in FIG. 5B by the flapper motor to open the bundle conveyance path 11, and then the discharge roller 40 is driven to rotate. Then, the sheet bundle S fed out by the paper discharge roller 40 is carried into the storage stacker 45 and sequentially stacked in an inverted posture as shown in FIG.

  Next, the control of the cutting means 30 and the bundle conveying means 20 will be described in detail. The case where the control means 26 is arranged in the sheet cutting apparatus A shown in FIG. 7 will be described. The control CPU (control means; hereinafter the same) 26 reads a control program from the ROM 27, reads data required for control, such as an operation delay time, from the RAM 28, and executes the operation flow shown in FIG. That is, the ROM 27 stores a control program for executing the operation flow described with reference to FIG. The control CPU 26 includes a cutting width setting unit 26a, an operation mode selection unit 26b, and a carry amount control unit 26c.

  Further, the control CPU 26 is provided with a time measuring means 26d for measuring the interval time of the cutting operation of the cutting means 30 and / or a humidity measuring means 26e for measuring the environmental humidity of the sheet cutting apparatus A. This is for estimating the state of occurrence of the rust, and the case where both are provided will be described below. The time measuring means 26d incorporates a time measuring clock 26dS in the sheet cutting apparatus A, and transmits time information from the clock 26dS to the control CPU 26. The control CPU 26 stores, for example, the time at that time as a signal that the cutting means 30 has finished cutting. Then, the interval time is calculated from the time difference when the next cutting means 30 operates (for example, when the apparatus is activated).

  The humidity measuring unit 26e incorporates a humidity sensor 26eS in the sheet cutting apparatus A, and similarly transmits humidity information to the control CPU 26. If the interval time and / or measured humidity is a reference value, for example, “A” time or more, “A%” or more, the control CPU 26 described later executes the second operation mode. For this reason, the control CPU 26 is provided with an operation mode selection means 26b, and preset interval time and humidity reference values are stored in the RAM 28. “1st operation mode” and “2nd operation mode” are selected. These operation modes will be described later with reference to FIG.

  On the other hand, the control CPU 26 is provided with a conveyance amount control means 26c and is connected to the lifting motor MU of the bundle conveyance means (rotary table unit) 20 described above. The aforementioned lifting motor MU is composed of, for example, a stepping motor, and is driven step by step as instructed by a command signal from the carry amount control means 26c. At the same time, the conveyance amount control means 26c includes a grip end sensor Sg for detecting the gripping of the sheet bundle S by the gripper 22 and a detection signal of a leading end detection sensor S2 for detecting the leading end of the sheet bundle S at the cutting position CP. Is transmitted. Further, the control CPU 26 is connected to the press end sensor Sp so as to obtain a cutting operation timing signal and control the cutter motor MC.

  Therefore, the first and second operation modes will be described with reference to FIG. 8. When the leading edge detection sensor S2 detects the leading edge of the sheet bundle S in step 104 described in the above-described operation flow (FIG. 6) (St104). The bundle conveying means 20 transfers the sheet bundle S to the cutting position CP (St105). The control CPU 26 executes the operation of transferring the sheet bundle S to the cutting position CP in the first and second operation modes.

  As shown in FIG. 8, for example, when the apparatus is activated, the control CPU 26 compares the interval time of the cutting operation with a preset reference time using other appropriate timing signals (St120). As described above, the reference time is set to the estimated time when the cutting blade is rusted. When the interval time is equal to or longer than the reference time, cutting is performed in the second operation mode (St122). In this comparison, when it is less than the reference time, it is compared whether or not the environmental humidity of the apparatus is more than the reference value (St121). When the interval time is less than the reference value and the environmental humidity is less than the reference value, the control CPU 26 performs cutting in the first operation mode (St123).

  In the first operation mode, the bundle conveying unit (rotary table unit) 20 transfers the sheet bundle S to the cutting position CP by the cutting width set by the cutting width setting unit 26a. That is, the feed amount of the bundle conveying means (rotary table unit) 20 is conveyed by the same amount as the finish cutting width. When the cutting unit 30 is operated in this state to cut the sheet bundle S, the sheet bundle S is cut to a finished size by one cutting.

  On the other hand, in the second operation mode, the bundle conveying means (rotary table unit) 20 transfers the sheet bundle S to the cutting position CP by a cutting width smaller than the final cutting width. Therefore, the cutting unit 30 is operated to primarily cut (pre-cut) the sheet bundle S. The cutting width in this case is set in advance from the finishing cutting width of the sheet bundle S such as “8 mm” (in this embodiment, the finishing cutting width in all cases is 8 mm or more, for example, 8 mm is not specified as 8 mm). deep. Alternatively, it is determined in advance, for example, by setting it to 1/2 of the finishing cutting width set by the cutting width setting means 26a. When the above-mentioned primary cutting is completed, the control CPU 26 executes the remaining cutting. The end of the operation of the cutting means 30 is canceled by a pressing end signal from the position sensor SHP or SCP of the cutting blade 31, for example. Then, the sheet bundle S is moved by a predetermined amount by the bundle conveying means (rotary table unit) 20. This movement amount is set to [(finish cutting width) − (primary cutting width)]. Note that data required for calculating the cutting amount in the first operation mode and the second operation mode is “final finishing size”, “used sheet size”, etc. from an input means (for example, key input device) prepared in the sheet cutting apparatus A. Is acquired from the input unit of the image forming apparatus arranged on the upstream side.

  Next, the pressing unit 32 is operated to press the sheet bundle S, and the cutting unit 30 is operated to perform cutting. With these two cutting operations, the sheet bundle S is cut into a predetermined finish size. Thereafter, the control CPU 26 proceeds to step 109 (St109) described with reference to FIG. 6 and executes the subsequent operation. Although the case where the primary cutting (pre-cut) is performed once has been described above, this may be performed twice or more times.

"Different embodiments"
In the second operation mode described above, the case where the cutting width is set by the feed amount by which the sheet bundle S is transferred to the cutting position CP by the bundle conveying means (rotary table unit) 20 at the time of primary cutting has been described. Even if it is configured such that the cutting blade 31 moves, the same result is obtained, which will be described with reference to FIG. As shown in the figure, a cutting blade 31 constituting the cutting means 30 is movably disposed along the bundle conveyance path 11. In the figure, a cutting unit equipped with a cutter motor MC, a cutting blade 31 and a cutting blade guide guide is attached to the apparatus frame by a screw shaft 37 so that the vertical position can be adjusted. A shift motor MS is connected to the screw shaft 37 via a belt 38. The cutting blade 31 is movable to a broken line position offset by a predetermined amount from the cutting position CP indicated by the solid line in the drawing by a cutting blade moving means 39 constituted by the shift motor MS and the screw shaft 37.

  Therefore, when the control CPU 26 executes the second operation mode, the shift motor MS of the cutting blade moving means 39 is activated to offset the cutting blade 31 by a predetermined amount (for example, 8 mm) from the cutting position CP and execute primary cutting. . Thereafter, the cutting blade 31 is moved to the cutting position CP to perform finish cutting. With this configuration, a plurality of cutting operations can be performed quickly. Other configurations are the same as those described above, and the same reference numerals are given and description thereof is omitted.

  The control CPU 26 has the first operation mode and the second operation mode, and shows either of the two modes selected by the operation mode selection means 26b. This operation mode selection means 26b is the time counting means 26d or 26 The case where the mode is selected by the information from the humidity measuring unit 26e has been described. In addition, the operation mode selection means 26b can select a mode by an instruction signal from the input means 29 without depending on these measurement means. For example, input means 29 such as a control panel is connected to the control CPU 26, and the operator selects the first operation mode or the second operation mode from the input means. Then, the control CPU 26 sets either the first or second operation mode based on the mode selection signal input from the input means 29. In this case, the input means 26 such as a control panel is disposed in the cutting apparatus A, or is disposed in an external bookbinding apparatus or image forming apparatus. With this configuration, the operator can perform cutting in the second operation mode described above according to the state of rust generated on the cutting blade 31 at any time.

"Configuration of image forming apparatus"
Next, the configuration of the bookbinding apparatus B that incorporates the sheet cutting apparatus A as a unit and the image forming apparatus C that is connected thereto will be described with reference to FIG. FIG. 11 shows the overall system configuration of the image forming apparatus C, bookbinding apparatus B, and sheet cutting apparatus A, and the configuration of each apparatus will be described below.

  As shown in FIG. 11, the image forming system according to the present invention includes an image forming apparatus C such as a copying machine, a printer, and a printing machine, and a bookbinding apparatus B provided on the downstream side of the image forming apparatus C. The illustrated apparatus is further provided with a finisher apparatus D on the downstream side of the bookbinding apparatus B. First, the image forming apparatus C includes a paper feed unit 60, a printing unit 70, and a paper discharge unit 80, and a plurality of print sheets having a predetermined standard size are stored in the paper feed cassette 61 in the paper feed unit 60. The paper feed cassette 61 is provided with paper feed means for separating and feeding the print sheets one by one, and the print sheet of the designated size is fed out to the paper feed path 62. Printing means 71 such as a printing drum is disposed in the paper feed path 62, and the illustrated one shows an electrostatic printing apparatus.

  A developing device 74, a laser transmitter 72, and a cleaning blade 73 are disposed around the photosensitive drum (printing means) 71, and an electrostatic latent image is formed on the photosensitive member by the laser transmitter 72. An image is transferred onto a print sheet by a transfer charger 75 with toner attached thereto, and fixed by a fixing device 76 disposed on the downstream side. The print sheet thus subjected to the printing process is sent to a paper discharge path (paper discharge unit) 80 and is carried out from a paper discharge port 81. A circulation path 82 is continuously provided in the paper discharge path 80, and a printed sheet printed on one side is switched back to reverse the conveyance direction, and then is reversed and circulated to the printing unit 70. Then, after printing on the back side, the paper is discharged from the paper discharge port 81. The paper discharge port 81 is provided with a paper discharge tray for stacking and storing normal print sheets. In the present system, the next bookbinding apparatus B is attached to the paper discharge port 81.

  The bookbinding apparatus B includes a saddle-stitched sheet carry-in path 90 that receives a print sheet from the paper discharge port 81 of the image forming apparatus C, and a stacking unit 91 that aligns and aligns the sheets from the saddle-stitched sheet carry-in path 90 in a bundle. A post-processing unit 92 that applies adhesive paste to one end edge (back portion at the time of bookbinding) of the sheet bundle from the stacking unit 91 and binds it into a booklet; and a stack unit (storage) that stores the post-processed sheet bundle. Stacker) 45. A bundle conveying means 94 for conveying the sheet bundle from the accumulation means 91 to the glue application position is provided, and the sheet bundle S accumulated in a substantially horizontal posture by the accumulation means 91 is changed in direction to a substantially vertical posture orthogonal thereto. The lower edge of the sheet bundle S is positioned at the glue application position.

  The post-processing unit 92 may be configured by a stapling device that staples the sheet bundle S. However, the illustrated post-processing unit 92 includes an “adhesive” for binding the sheet bundle S with a cover sheet and mounting it. The application means 95 ”and the“ binding means 96 ”of the sheet bundle S and the cover sheet are configured. Further, the illustrated post-processing unit 92 includes a “cutting unit 30” that trims and cuts the periphery of the sheet bundle that is bound to the cover sheet.

  On the other hand, a cover sheet conveyance path 83 for feeding a cover sheet is branched from the saddle stitching sheet carry-in path 90, and the cover sheet conveyance path 83 is a bookbinding process path for conveying the sheet bundle S by the bundle conveyance means 94. 84 so as to cross 84. A cover sheet on which a title or the like is printed by the image forming apparatus C is supplied to the cover sheet conveyance path 83 via the conveyance path 83 to an intersection F which will be described later. On the other hand, the cover sheet may be supplied from an inserter device (not shown) prepared separately from the image forming apparatus C. In this case, the cover sheet conveyance path 83 can be configured as a path independent of the saddle stitching sheet carry-in path 90.

  A binding means 96 is disposed at an intersection (indicated by arrow F in the figure) between the cover sheet conveyance path 83 and the bookbinding path 84. The binding unit 96 makes the center of the sheet bundle coincide with the center line of the cover sheet at the intersection F between the cover sheet fed from the cover sheet conveyance path 83 and the sheet bundle fed from the bookbinding processing path 84. It is composed of a folding blade 96a and a folding roll 96b that are joined in an inverted T shape and fold the cover sheet in this state. A pair of left and right folding blades 96a are provided at the intersection F, and are configured to be pressed and separated from each other. The folding roll 96b is disposed on the downstream side of the folding blade 96a and is composed of a pair of roller members facing each other. The back bundle is formed by pressing the sheet bundle and the cover sheet that are butted in an inverted T shape by the folding blade 96a and the folding roll 96b, and at the same time, the sheets are bound together with the adhesive paste applied to the sheet bundle side.

  The sheet cutting apparatus A described above is incorporated as a unit downstream of the binding means 96. Since the illustrated one has the same configuration as described above, the same number is assigned and the description thereof is omitted. The bookbinding apparatus B configured in this manner sequentially receives the print sheets carried out from the paper discharge port 81 of the image forming apparatus C from the saddle stitching sheet carry-in path 90 and accumulates them on the accumulating means 91 to align them. This sheet bundle is converted into a vertical posture by the bundle conveying means 94, adhesive glue is applied to the lower end edge thereof by the adhesive applying means 95, and the sheet is bound and bound to the cover sheet by the downstream binding means 96. The booklet-like sheet bound in this way is trimmed and trimmed at its periphery by the cutting means 30 as necessary, and is carried out to the stack means 45.

  As shown in FIG. 11, a discharge path 86 is connected to the cover sheet conveyance path 83, and a finisher device D is connected to the discharge path 86. The finisher apparatus D stores the print sheet not subjected to the bookbinding process from the image forming apparatus C to the paper discharge tray 55 via the saddle stitch sheet carry-in path 90 and the cover sheet transport path 83. Further, the finisher D can be provided with post-processing functions (not shown) such as stapling, punching, and stamping, which are different from the bookbinding processing described above. Since the mechanism is known, explanation is omitted.

1 is an overall configuration diagram of a sheet cutting apparatus according to the present invention. The principal part perspective view of the apparatus of FIG. FIG. 3 is a plan view of the apparatus of FIG. 2. Structure explanatory drawing of a press means. The position state of the cutting blade in the apparatus of FIG. 1 is shown, (a) shows the case where the cutting blade is in the standby position, and (b) shows the case where it is in the cutting position. The flowchart which shows the cutting operation | movement of the apparatus of FIG. The flowchart which shows the control means of a sheet cutting apparatus. The flowchart which shows the operation mode of a sheet cutting apparatus. It is explanatory drawing of cutting, (a) is a perspective view which shows the state of cutting, (b) is explanatory drawing of cutting width. The modification of a 2nd operation mode. 1 is a schematic configuration diagram of an image forming system including a sheet cutting device according to the present invention.

Explanation of symbols

11 Bundle transport path 12 Loading roller 20 Bundle transport means (rotary table unit)
21 Rotating table 22 Gripper 23 Unit frame 26 Control means (control CPU)
30 Cutting means 31 Cutting blade 32 Pressing means 33 Die member 37 Screw shaft 38 Belt 39 Moving means 40 Paper discharge roller 42 Flapper MC Cutter motor MG Gripper motor MT Turning motor MU Lifting motor MP Press motor S1 Sheet sensor S2 Tip detection sensor

Claims (5)

Pressing means for holding the sheet bundle at a predetermined cutting position;
Cutting means for cutting the sheet bundle held by the pressing means;
A bundle conveying means for feeding the sheet bundle to the cutting position;
Control means for controlling the cutting means and the bundle conveying means, and a sheet cutting apparatus comprising:
The control means has a cutting width setting means for setting a cutting width from the paper size information of the sheet bundle and the final finishing size information,
The control means feeds a sheet bundle to the cutting position by the bundle conveying means, and a first operation mode in which the sheet bundle is cut by the cutting means with a finishing cutting width set by the cutting width setting means. The bundle conveying means feeds the sheet bundle to the cutting position, and the cutting means cuts the sheet bundle a plurality of times with a cutting width smaller than the finishing cutting width set by the cutting width setting means. A second operation mode for cutting the width,
The control means further comprises time measuring means for measuring an interval time of the cutting operation of the cutting means, and the cutting means in the second operation mode when the time measured by the time measuring means is equal to or more than a preset reference time. sheet cutting device is cutting the sheet bundle, characterized Rukoto to cut the sheet bundle by the cutting means measurement time said counting means has measurement in the first operation mode when less than said reference time by. Pressing means for holding the sheet bundle at a predetermined cutting position;
Cutting means for cutting the sheet bundle held by the pressing means;
A bundle conveying means for feeding the sheet bundle to the cutting position;
Control means for controlling the cutting means and the bundle conveying means, and a sheet cutting apparatus comprising:
The control means has a cutting width setting means for setting a cutting width from the paper size information of the sheet bundle and the final finishing size information,
The control means feeds a sheet bundle to the cutting position by the bundle conveying means, and a first operation mode in which the sheet bundle is cut by the cutting means with a finishing cutting width set by the cutting width setting means. The bundle conveying means feeds the sheet bundle to the cutting position, and the cutting means cuts the sheet bundle a plurality of times with a cutting width smaller than the finishing cutting width set by the cutting width setting means. A second operation mode for cutting the width,
The control means further includes humidity measurement means for measuring the environmental humidity of the apparatus, and when the humidity measured by the humidity measurement means is equal to or higher than a preset reference humidity, the sheet bundle is bundled by the cutting means in the second operation mode. The sheet cutting apparatus, wherein the sheet bundle is cut by the cutting unit in the first operation mode when the humidity measured by the humidity measuring unit is less than a preset reference humidity. Pressing means for holding the sheet bundle at a predetermined cutting position;
A bundle conveying means for feeding the sheet bundle to the cutting position;
A cutting means having a cutting blade disposed at the cutting position so that the position thereof can be adjusted along the feeding direction of the sheet bundle;
Cutting blade moving means for shifting the position of the cutting blade;
Control means for controlling the cutting means, the bundle conveying means and the cutting blade moving means, and a sheet cutting apparatus comprising:
The control means has a cutting width setting means for setting a cutting width from the paper size information of the sheet bundle and the final finishing size information,
The control unit includes a first operation mode in which the cutting blade is offset by the cutting blade moving unit and the sheet bundle is cut by the cutting unit with a finishing cutting width set by the cutting width setting unit; by offsetting the cutting blade by blade moving means second to cut the finish cutting width of by cutting a plurality of times the sheet bundle by the cutting means at the set finish cutting width smaller than a cutting width by the cutting width setting means have a mode of operation,
The control means further comprises time measuring means for measuring an interval time of the cutting operation of the cutting means, and the cutting means in the second operation mode when the time measured by the time measuring means is equal to or more than a preset reference time. sheet cutting device is cutting the sheet bundle, characterized Rukoto to cut the sheet bundle by the cutting means measurement time said counting means has measurement in the first operation mode when less than said reference time by. Pressing means for holding the sheet bundle at a predetermined cutting position;
A bundle conveying means for feeding the sheet bundle to the cutting position;
A cutting means having a cutting blade disposed at the cutting position so that the position thereof can be adjusted along the feeding direction of the sheet bundle;
Cutting blade moving means for shifting the position of the cutting blade;
Control means for controlling the cutting means, the bundle conveying means and the cutting blade moving means, and a sheet cutting apparatus comprising:
The control means has a cutting width setting means for setting a cutting width from the paper size information of the sheet bundle and the final finishing size information,
The control unit includes a first operation mode in which the cutting blade is offset by the cutting blade moving unit and the sheet bundle is cut by the cutting unit with a finishing cutting width set by the cutting width setting unit; A second cutting unit that offsets the cutting blade by a blade moving unit and cuts the sheet bundle a plurality of times by the cutting unit with a cutting width smaller than the finishing cutting width set by the cutting width setting unit and cuts the sheet by the finishing cutting width. Has an operating mode,
The control means further includes humidity measurement means for measuring the environmental humidity of the apparatus, and when the humidity measured by the humidity measurement means is equal to or higher than a preset reference humidity, the sheet bundle is bundled by the cutting means in the second operation mode. The sheet cutting apparatus, wherein the sheet bundle is cut by the cutting unit in the first operation mode when the humidity measured by the humidity measuring unit is less than a preset reference humidity. The cutting width setting means has input means for inputting paper size information and final finishing size information, and is configured to calculate a finishing cutting width based on information from the input means. sheet cutting apparatus according to any one of claims 1 to 4.

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